package thread;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

public class SyncDemo4 {
    public static void main(String[] args) {
        Set<Integer> c = Collections.synchronizedSet(new HashSet<>());

        Thread t1 =new Thread(){
          public void run(){
              for (int i =0;i<1000;i++){
                  c.add(i);
              }
          }
        };
        Thread t2=new Thread(){
            public void run(){
                for (int i=1000;i<2000;i++){
                    c.add(i);
                }
            }
        };
        t1.start();
        t2.start();
        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
        }
        System.out.println(c.size());
    }
}
